Rotary screen



1. Ml. AND A.' LSTGNE. ROTARY SCREEN APPLICATION FILED APR. 17, 1919- g3 3,41 Patented Apr. 5f, w21.

NUHRIS FEYERS. NC.. LITHD.. WASHINGTDN. D l

UNH-ED MES emes] JOHN M. STONE ANI) AvoN I.. sTONn, or sTo/oKToN,vv oALiFoRNIA'AssIGNo-RSVTO RATION `or CALIFORNIA.

GRAVITY GRAIN-GRADER- COMPANY, for JSTOOKTON, CALIFORNIA, Aoosrofi j ROTARY SCREEN.

To all whom c't'mag/ concern.' ,f

Be it known that we, JOHN STONE and AvoN- L. STONE, citizens of the United States, residing at Stockton, inthe county of San Joaquin and State of California, have invented certain fnewand useful Improvements in yRotary Screens, of which the following is a specification.

They invention -is primarily designed to provide a grain cleaning screenof the rotary type which embodies a substantial frame-work and a screening surface ofwire, the .frame-work being eXpansible to yadmit of subjecting the screening surface to proper tension, .said screening surfaceL preferably consisting of a wire which is wrapped about the frame-work and secured in any suitable way thereto at its-ends, the screen comprising a plurality of sides. I

The invention furthermoreaims to provide a separating screen which may beY con structed at a comparatively small cost and which provides for subjecting the screen surface to any degree of tension -so 'as to obtain the best possible results in the Operation and working of the screen.

The drawing illustrates a preferred embodiment of the invention. However, it is to be understood that in adapting the same to meet different conditions, various changes in the form, proportion, and minor details of construction may be resorted towithout departing from the nature of the'invention as claimed hereinafter.

Referring to the drawing hereto attached,

Figure 1 is a side view of a rotary separating screen embodying the invention and having the major portion of the screen surface omitted to bring out more clearly the construction of the frame-work.

Fig. 2 is an end view and Fig. 3 is a detail perspective view of a portion of one of the ribs.

Corresponding and like parts are referred to in the following description and indicated in the several views of the drawing by like reference characters.

The screen comprises a shaft 1 which in the preferable construction consists of a pipe or tube of suitable length and diameter. plurality of collars 2 is secured on the shaft 1 by means of set screws 3 or other suitable fastening means. Arms 4 have their inner ends let into openings formed radially in the j 'Specification of Letters Patent. `w PtenfedApI-jj'lgl. Appncationmed Aprii 17, 191e.V serialNonaaac-llf i '9 'collars 2 andjthe'ir outer-ends'v are forked, as

Vindicated at 5 to Areceive ribs 6 which/'are of V or angle form and disposed with their hollow sides-facing outwardly. The inner ends of the arms 4 are threaded vfor a short dis-V tance, as indicated at 7 'and receive adjusting nuts 8 by -means ofwhich the arms lmay be'moved radially. The ribs 6 extend Y `in parallel relation 'toone another and to 1 thetshaftland are Asecured to the outer ends of the arms 4in-any way. *By having the ribs 6 formed'of V or Sangle iron, a light4 and durable structureresults. The outer edges ofthe wings :or flanges 'of each of the ribs 6 are formed'withl notchesY 9,'-as indicated most clearlyin Fig. 3 to receive thel wire V10 which constitutes the screen surface, thereby holding the windings of' the wire in'ixed relation. 1

The 4wire'lO may be of any gage or material and preferably consists of steel wireA 19 gage which is secured atv one end and after being wrapped around the ribs is'made secure at'theother end. The'f'shaft 1, collars 2, arms 4fl andribsy-G ,constitute the framework of theV screen and 'the wirey 10 wrapped around the frame-work forms the screen surface, the spaces between the winds being determined by the distance between the notches 9 and forming the escape `for cracked grain and other material` to be separated from the selected grain which passes through the screen and is delivered from the discharge end thereof.

Strips 11 are interposed 'between adjacent ribs and are disposed diagonally or at an inclination, as indicated Ymost clearly in Fig. 1. The strips 11 have their ends bent and secured to the sides of adjacent ribs by suit'- able fastening means. provided for every alternate pair of ribs, as shown most clearly in Fig.A 2, the intermediate pairs of ribs being free from suchr strips, whereby an unobstructed passage is providedfor the delivery ofthe grain. The strips 11 are spaced from the screening sur- These strips 11 are,A

face 10 adistance to .provide for a passage of a layer of grain, thereby insuring a thorough separation of broken grain, weedsv and other small particles required to beV panded to tighten the screen surface by apsurface without throwing the same.

plying a wrench or other tool to the nuts 8 and turnngthe same to move the arms'4` and the ribs 6 outwardly. It will be understood that the Yscreening surface may be subjected to any required tension. The space between adjacent ribs corresponds to a side, c hence the screen may have any number of A,

vwhich allows grain suliicient time to slide down the wires comprising theA screenling he grain to be cleaned and separated enters one end of the screen and as the screen rotates slowly one side after another rises, thereby causing the grain to slide downward. As the grain slides down the inclined side a certain amount passes beneath the strips V11, but the bulk of the grain passes alongthe side of thestrips 11, and is driven by them in the direction -of the discharge end of the screen. This skimming process allows a uniform stream of grain to slideY from one side of the screen to the next and at the same time keeps a steady How of grain moving toward the delivery end. Y Y

The foregoing description and the draw? ing have reference to what may be considered the preferred, or approved form of our invention. It is to be understood that we may make such changes in construction by Letters Patent is 1, A rotary screen comprising `a plurality screen surfaces supported by the ribs, and diagonally disposed strips successively ar-r ranged between alternate pairs of ribs and kspaced from the vscreening surfaces to provide means,r for advancing material from the of Yribs disposed about anV axial'support,

receiving end of the screen tothe discharge end.

of ribs disposed about anaxialfsuppora'a screen surface supported by the ribs and in-` clined strips between every'` alternate pair 2. A rotaryfscreen,.comprising a plurality t of ribs andspaced from the screen surface to successively advance the screen contents toward the discharge end,

3; A rotary screen having a plurality of screening surfaces, and'inclined strips cross; ing the screen at alternate from the screening surfaces yto provide tortuous passages for advancing the screen contents over the screen surfacesv and to the discharge end of the screen. 'f

In testimony whereof we affix our signatures in presence'of two witnesses.

v 'JOHN M. STONE. A AVON L'. STONE.

Witnesses f Y,

H. R. MENOFEE, VBEN BERRY.

sides and Y spaced 

